1. Python Basics
- python is a dynamic, interpreted, object
oriented programming language
- source code does not declare the types
of variables, or parameters or methods
Static: Dynamic:
static int a_number; a_number = 42
a_number = 42;

2. Python Basics
- readable, flexible code
- lose the compile-time type checking in
the source code; higher productivity
- code is checked at runtime

3. Python Interpreter
- good for learning the language
- good for experimenting with the library
- helpful functions: dir(), help()

4. Python Variables
radius = 4
pi = 3.14
area = pi * radius * radius

5. Python Strings
- python string are immutable
spell = 'abrakadabra'
len(spell) >>> 11
a = Python
'Hello %s' %a >>> 'Hello Python'
a.lower() >>> 'python'
a.find('t') >>> 2
a[start:end]

6. Python Indentation
def fib(n):
print 'n=', n
if n > 1:
return n * fib(n-1)
else:
print 'end of line'
return 1

7. Python If Statement
- python does not use { } to enclose blocks of code for
if/loops/function etc.
- uses the colon “:” and indentation/whitespace to
group statements
- '==' is overloaded to work correctly with strings
if speed > 80:
print 'License and registration please'
if mood == 'terrible' or speed >= 100:
print 'You have the right to remain silent'
elif mood == 'bad' or speed >=90:
print “I'm going to have to give you a ticket”
else:
print “Let's keep it under 80, ok?”

8. Python For Statement
for x in range(5):
print x
for x in xrange(10):
if x % 2 == 0:
continue
print x
primes = [2, 3, 5, 7]
for prime in primes:
print prime

9. Python For Statement
for n in range(2, 10):
for x in range(2, n):
if n % x == 0:
print n, 'equals', x, '*', n/x
break
else:
print n, 'is a prime number'

10. Python Lists
pets = [2, 'dogs', ['and', 'one', 'cat']]
pets[1] >>> dogs
pets[2] >>> ['and', 'one', 'cat']